obama along with former president bill clinton, george w. bush and jimmy carter will attend a memorial service for nelson mandela on tuesday. >>> the outside demonstrations that eventually help bring down the apartheid government in south africa actually began here in washington. one of the organizers was randall robinson, founder of transafrica. here's what he told cbs veteran correspondent bob schieffer today. >> when we went to the embassy and met with ambassador foray, we told him we wouldn't leave until nelson mandela had been released from prison. at the time few americans knew much about nelson mandela and we thought we had to build a big public story, more information in america that would inform americans about the role that our country had been playing. the ambassador had us arrested and that was followed by 5,000 americans who came to the embassy over the next year every day to be arrested. >> robinson now lives in st. kidd. he's the younger brother of the late max robinson, former news anchor here at channel 9. wusa9 will cover a